Pump drive



May l0, 1932.

A. M. BABITCH PUMP DRIVE Filed July '7; 1928 za'v Patented May 10, 1932l UNITED 4STATES PATENT OFFICE ABRAHAM M. BABITCH, OF FLINT, MICHIGAN, .ASSEGNOB T A. C SPARK PLUG Comm,

OF FLINT, MICHIGAN, A COMPANY OF MICHIGAN i PUMP Application l'ed July 7,

This invention relates to a drive for a fuel pump of a type that is currently used upon internal combustion engines, and the like; and it is an object of this invention to pro- 5 vide a variable-stroke pump with improved actuating means including a shaft having a bearing in a pump body and provided with means for its rotation from some suitably rotating part usually included in an automotive organization. The rotative part referred to may be such as the crank shaft or cam shaft of an engine, a generator shaft, a centrifugal pump shaft, a distributor shaft,-in fact, any rotating member included in or associated with the power-I plant of a motor vehicle or the like and disposed either coaxially with or at an angle to the firstmentioned shaft.

A variable-stroke fuel pump being described and claimed in a copending application N. 123,370,I filed July 19, 1926) a thrust-refusing intermediate means comprising a linkage is used therein conditionally to transmit motion,-to effect the intake stroke of a pumping element in the form of a flexible diaphragm; but a lever, extendin from an engine casing into a pumpbody an uniformly oscillated by means such as a camV on a crank shaft or on a cam shaft, is therein used as an actuating element for said linkage; and it is an object of my present invention, obviating use of such a lever (and all necessity for the large opening required therefor) to employ a rotated actuating element, extending into the pump body and there-carrying an eccentric part to impart movement to thrust-refusing intermediate means such as the mentioned linkage.

Other objects of this invention, which may 40 ordinarily involve the provision of a bearing or bearings in the mentioned pump body for the mentioned pump-actuating shaft, and in which said shaft may ordinarily be horizontally ldisposed and terminated within the mentioned housing, being there provided DRIVE 1,928. Serial No. 290,964.

Fig. 3 is a view similar to Fig. 2, but show I ing alternative features hereinafter described.

Figs. 4 and 5 are respectively views showing mechanical trains suggested asrespectively suitable for use in transmitting motion from a horizontal shaft and from a vertical shaft, with or without a speed-reducing effect, to a horizontal-pump-actuating shaft such as that which is shown centrally in Fig. 1,-- bearing and associated parts being omitted.

Referring first'to the conventional part of that embodiment of the present invention which is shown in Figs. 1 and 2, a main casting .or pump body 10 and a cover casting 11 are shown as (bo-operating in the retention of a reciprocable pumping element in the form of a iexible diaphragm 12. The cover casting 11 is shown as carrying not only an inlet valve organization at 13 and an outlet valve organizationv at 14 but also a sight cup or filter cup 15,-the construction here referred to being such that, upon reciprocation of the diaphragm 12, liquid fuel entering' through a pipe 16 and passing through the cup 15 and past the valve at 13 may enter ay pump chamber 17, vto exitl therefrom past valve 14 and through an outlet 18,-adapted to receive a deliver pipe leading to a carburetor (not showng. v

Expulsion strokes being preferably lmparted to the diaphragm 12, or its equivalent, by resilient means such .asa compression spring 19 (and the action of this spring being conditioned upon the amount of pressure built up within the pump chamber 17) intermediate thrust-refusing means such as a slidable rod 20 and links 21 and 22 may be employed to impart intake movements to said diaphragm, subject to actuation by means such as are next to be described.

The main pump body casting 10, serving to house any suitable thrust-refusing means, may comprise also a lateral bearing eXtension 23,-shown as rigidly connected therewith by means comprising a diagonal re-enforcing web 24 and as adapted to receive a rotatable element in the form of a shaft 25; and the latter is designed to serve as, or to be comprised in, actuating means for the thrustrefusing linkage above referred to. For example, assuming the'shaft 25 to inwardly terminate in a wrist-pin 26, this wrist-pin may be received in a suitable aperture in the lower end of the link 22, substantially as illustrated in Figs. l and 2. Alternatively, assuming the shaft 25 to inwardly terminate in or to be provided with an eccentric element in the form of a cam 26', the latter may engage a lever 27, shown as pivoted at 28 to the lever 22 and as pivoted at 29 to a main casting 10,-said lever being positioned entirely within the main casting and being preferably provided with resilient means, such as a compression spring 30, adapted to hold the same at all times in contact with the cam 26.

The shaft 25 may be provided at its end opposite from the crank pin 26 or the cam 26 with means such as key or joint 31, adapting the same to be engaged by, for example, a shaft 32 included in some generator 33, or the like.

ln Fig. 4, the shaft 25, although still horizontal, is shown as driven from an additional horizontal shaft 34:, extending substantially at right angles thereto., by means comprising a worm gear 35 upon the former shaft and a worm 36 upon the shaft 34; and in=Fig. 5, in order to drive the horizontal shaft 25 from a substantially vertical shaft 34?, the shafts 25 and 3d are shown as respectively provided with beveled `gears 35 and 36".

rllhe general mode of operation of a pump of the described character being obvious from the foregoing. and the main features thereof being fully set forth in my mentioned copending application. it will be understood that as soon as operation of a pump of the described character builds up a pressure within the pump chamber l? such pressure tends to hold the diaphragm 12 against upward movement,-the stroke of the pumping element being thereby rendered variable; but my present invention relates exclusively to the use of-a rotatable element such as the shaft 25 in actuating a reciprocatory pump element,-a stroke thereof being preferably variable and preferably effected through means such as a slidable rod and links, or the like, disposed in a plane at an angle to the' aXis of said shaft.

The construction illustrated in Figs. 1 and 2 (all of the described constructions being adapted to make use of some eccentric element upon or near the inner end of a shaft 25) has the advantage of simplicity; but it will be obvious that a long stroke may be provided for by means such as are illustrated in Fig. 3; and obvious also that either the crank-pin construction of Figs. 1 and 2 or the cam-andlever constructionl of Fig. 3 may be employed in organizations such as are suggested in Figs. 4 and .f2-*the latter being intended primarily to illustrate the practicability of driving the shaft 25, or its equivalent, from a shaft disposed at an angle thereto-and the practicability of incidentally effecting any desired change in the rate of rotation of the pumpactuating shaft 25, as compared with that of any shaft from which power may be taken.

Although but a limited number of embodiments of the present invention are above described, it will be obvious that numerous additionall mddiications thereof might easily be devised' by workers in the arts to which this case relates-without involving the least departure from the scope of the invention as indicated above and in the following claims.

l claim:

1. ln a fuel pump of the class described, a hollow body part having a laterally extending bearing for a rotatable shaft adjacent its lower end, a cover fastened to the upper end of said body part, a lflexible pumping diaphragm 'held between said cover and upper end, a reciprocating operating rod the upper end of which is connected with said diaphragm, a guide for said rod, a spring surrounding said operating rod and acting to force it and said diaphragm upward, two links arranged as a toggle, said links `being pivotally connected together and the upper end of the upper of them being pivotally connectcd with the lower end of said operating rod, a third link one end of which is pivot-ally supported within said pump body, and the other end of which is pivotally connected with the lower end of the lower one of said two links, and a shaft rotatable in the bearing aforesaid and the inner end of which is operatively associated with said third link.

2. ln a fuel pump of the class described, a hollow body part having a laterally extending hearing for a rotatable shaft adjacent its lower end, a cover fastened to the upper end of said body part, a flexible pumping diaphragm held between said cover and upper end, a reciprocating'operating rod the upper end of which is connected with said diaphragm, a guide for said rod, a spring surrounding said operating rod and acting to force it and said diaphragm upward, two links arranged as a toggle, said links being nemesio pivotally ocnmneotetiv together and the up g.; end of the upper o them being pivotelly coul nected with the lower end of said operating ro, a, third link one en of which is pivoteiiy supported within said pump body, and the other end of which is pivotally connecteci with the lower end of the lower one of said. two links, acover for closing the lower end of said body part, at spring acting between said covernnd said third link to swing said. link upwerv about its pivotal support, and a, shaft rotatable in the bearing aforesaid andi the inner end of which has a, cam. which acts upon the upper side of esiti third link to swing it downward about its pivotai support,

In testimony whereof ax my signature ABRM M. BABITCH. 

